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This species is accepted, and its native range is N. & N. Central Japan.

[GB]
Morphology General Habit
Perennial. Rhizomes short. Culms 80-200 cm long; 5-7 -noded. Culm-internodes smooth, or scaberulous. Leaf-sheaths smooth, or scaberulous; pubescent. Ligule an eciliate membrane; 1-3 mm long; pubescent on abaxial surface. Leaf-blades 20-35 cm long; 4-12 mm wide; stiff. Leaf-blade surface smooth, or scabrous; rough on both sides.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Peduncle antrorsely scabrous above. Panicle open; lanceolate, or ovate; 12-30 cm long; 7-15 cm wide. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5-0.75 length of lemma.
Fertile
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5-0.75 length of lemma.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny. Lower glume lanceolate; 4-6 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 4-6 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein scabrous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate; 3.5-5.5 mm long; membranous; without keel; 3-5 -veined. Lemma lateral veins extending close to apex. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.3-0.5 way up back of lemma; straight, or geniculate; 5-6 mm long overall; without a column, or with a straight or slightly twisted column.
Morphology Reproductive morphology Flowers
Lodicules 2. Anthers 3; 2 mm long. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; oblong; 2 mm long. Hilum punctiform. Disseminule comprising a floret.
Distribution
Asia-temperate: eastern Asia.
Reference
Aveneae. Koyama 1994.

Native to:

Japan

Calamagrostis gigas Takeda appears in other Kew resources:

First published in Bot. Mag. (Tokyo) 24: 43 (1910)

Accepted by

  • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Koyama, T. (1987). Grasses of Japan and its neighboring regions: an identification manual: 1-570. Kodansha, Tokyo, Japan.

Literature

Kew Backbone Distributions

  • Koyama, T. (1987). Grasses of Japan and its neighboring regions: an identification manual: 1-570. Kodansha, Tokyo, Japan.

GrassBase - The Online World Grass Flora
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0